[Bug 216304] Adding xn0 to bridge0 causes kernel panic

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Wed Feb 1 20:27:45 UTC 2017


--- Comment #8 from commit-hook at freebsd.org ---
A commit references this bug:

Author: kp
Date: Wed Feb  1 20:27:38 UTC 2017
New revision: 313050
URL: https://svnweb.freebsd.org/changeset/base/313050

  MFC 312782

  bridge: Release the bridge lock when calling bridge_set_ifcap()

  This calls ioctl() handlers for the different interfaces in the bridge.
  These handlers expect to get called in an ioctl context where it's safe
  for them to sleep. We may not sleep with the bridge lock held.

  However, we still need to protect the interface list, to ensure it
  doesn't get changed while we iterate over it.
  Use BRIDGE_XLOCK(), which prevents bridge members from being removed.
  Adding bridge members is safe, because it uses LIST_INSERT_HEAD().

  This caused panics when adding xen interfaces to a bridge.

  PR:           216304
  Reviewed by:  ae
  Sponsored by: RootBSD
  Differential Revision:        https://reviews.freebsd.org/D9290

_U  stable/11/

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